Li Na of China serves to Sofia Arvidsson of Sweden at the U.S. Open tennis championships in New York August 28, 2013.RAY STUBBLEBINE/Reuters
Li Na of China (L) hits a return to Sofia Arvidsson of Sweden at the U.S. Open tennis championships in New York August 28, 2013.RAY STUBBLEBINE/Reuters
Li Na, of China, returns a shot against Sofia Arvidsson, of Sweden, during the second round of the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.Kathy Willens/The Associated Press
Li Na of China (L) is congratulated by Sofia Arvidsson of Sweden after she won their match at the U.S. Open tennis championships in New York August 28, 2013.ADAM HUNGER/Reuters
Maria-Teresa Torro-Flor of Spain returns to Agnieszka Radwanska of Poland at the U.S. Open tennis championships in New York August 28, 2013.MIKE SEGAR/Reuters
Agnieszka Radwanska of Poland returns to Maria-Teresa Torro-Flor of Spain at the U.S. Open tennis championships in New York August 28, 2013.MIKE SEGAR/Reuters
Sloane Stephens, of the United States, returns to Urszula Radwanska of Poland, during the second round of the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.Charles Krupa/The Associated Press
Venus Williams of the U.S. walks off the court during a rain delay in her match against Jie Zheng of China at the U.S. Open tennis championships in New York August 28, 2013.Reuters
Spectators wait out a weather delay at the U.S. Open tennis championships in New York August 28, 2013.ADAM HUNGER/Reuters
Spectators wait out a rain delay at the U.S. Open tennis championships in New York August 28, 2013.ADAM HUNGER/Reuters
Workers vacuum water off a court following wet weather and a suspension of play at the U.S. Open tennis championships in New York August 28, 2013.ADAM HUNGER/Reuters
A court attendant moves water off one of the outer courts at the Billie Jean King Tennis Center during a rain delay at the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.David Goldman/The Associated Press
Mikhail Youzhny, of Russia, reacts during a first round match to Nicolas Mahut, of France, during the first round of the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.Mike Groll/The Associated Press
Mikhail Youzhny wipes sweat from his face during a first round match against Nicolas Mahut at the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.Mike Groll/The Associated Press
Venus Williams of the U.S. waits for a serve from Zheng Jie of China during their match at the U.S. Open tennis championships in New York August 28, 2013.MIKE SEGAR/Reuters
Juan Martin Del Potro of Argentina serves to Guillermo Garcia-Lopez of Spain at the U.S. Open tennis championships in New York August 28, 2013.SHANNON STAPLETON/Reuters
Zheng Jie of China hits a return to Venus Williams of the U.S. at the U.S. Open tennis championships in New York August 28, 2013.MIKE SEGAR/Reuters
James Blake of the U.S. returns a forehand to Ivo Karlovic of Croatia at the U.S. Open tennis championships in New York, August 28, 2013.RAY STUBBLEBINE/Reuters
Andy Murray of Britain reaches for a shot behind his head during his U.S. Open tennis championships match against Michael Llodra of France in New York, August 28, 2013.SHANNON STAPLETON/Reuters
Zheng Jie of China celebrates defeating Venus Williams of the U.S. at the U.S. Open tennis championships in New York August 28, 2013.RAY STUBBLEBINE/Reuters
Venus Williams of the U.S. reacts after a missed point against Zheng Jie of China at the U.S. Open tennis championships in New York August 28, 2013.RAY STUBBLEBINE/Reuters
Juan Martin del Potro, of Argentina, yells and pumps his fist after beating Guillermo Garcia-Lopez, of Spain, in the first round of the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.Charles Krupa/The Associated Press
Laura Robson of Britain celebrates during her match against Caroline Garcia of France at the U.S. Open tennis championships in New York August 28, 2013.ADAM HUNGER/Reuters
Venus Williams of the U.S. leaves the court after losing her second round match to Zheng Jie of China at the U.S. Open tennis championships in New York August 28, 2013.SHANNON STAPLETON/Reuters
James Blake of the U.S. waves to the crowd after losing to Ivo Karlovic of Croatia at the U.S. Open tennis championships in New York August 28, 2013. Blake had announced that he would retire after the U.S. Open.SHANNON STAPLETON/Reuters
Marcus Leitch, 11, of Toronto, waits for an autograph from Milos Raonic, of Canada, during the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York.David Goldman/The Associated Press
Dickie Lee strings a racket for player Christopher Kas while competition on the courts is halted by a threatening thunderstorm at the U.S. Open in New York, Aug. 28, 2013.RICHARD PERRY/The New York Times